1
Division of Enterprise Administration
Primary Statistics 3205
Last Examination
Amaechi N. Nwaokaro, PhD
Instruction: Instruction: Reply all of the questions with the important thing phrase or phrases in Half A.
An ideal reply to every query partially A is value 2 share factors (20 share
factors) for the 10 questions. Resolve the Issues in Components B and C and reply the
questions following every. Every excellent resolution to B and C components is 40 share factors
(80 share factors). The least share factors from all of the components is 100.
Half A
1) What’s the thought behind frequency distribution?
2) Which is the widespread sampling methodology?
three) What’s the measure of central tendency known as?
four) What statement principally describes a pattern measurement?
5) What’s the measure of dispersion from a imply known as?
6) Pattern imply or the inhabitants imply: which varies probably the most?
7) Pattern imply or particular person statement: which varies probably the most?
eight) What’s the profit of accelerating the pattern measurement?
9) Numerically characterize a Normal Regular Distribution
10) What’s the essential attribute of t-distribution?
2
Half B
2) With the next randomly chosen observations:
a) Decide the Regression Equation.
b) Decide the worth of Y hat when X is 7
X Y XY X
2
5 13
three 15
6 7
three 12
four 13
four 11
6 9
eight 5
Half C
2) From the next randomly chosen observations:
a) Decide the Pearson Coefficient of Correlation, r.
b) Interpret the affiliation between X and Y.
c) Estimate the Coefficient of Dedication, R
2
.
X X-x (X- x )
2 Y (Y-y) (Y-y) 2
(X-x)(Y-y)
5 13
three 15
6 7
three 12
four 13
four 11
6 9
eight 5
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